This article explains the internal mechanics of MySQL 8.0 InnoDB pages, how random primary keys such as UUID cause costly page splits and merges, and provides Java‑level best practices and MySQL commands to optimize primary‑key design for better performance and space utilization.
This article provides detailed explanations of ten core MySQL topics—including InnoDB lock upgrades, redo log mechanics, MVCC version chains, tablespace types, page splitting, optimizer plan selection, crash recovery, binlog vs redo log, adaptive hash index, and memory management—along with practical tips for avoiding pitfalls and tuning performance.
After a normal DDL change on the OneDBA platform, a table's storage grew nearly 100% and some queries slowed down, revealing a MySQL InnoDB B+Tree page‑split flaw that stores only one row per 16KB page when large records are inserted, which also corrupts statistics and leads to slow SQL.
